Predictions for azimuthal anisotropy in Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV using a multiphase transport model

Xe+Xe collision at relativistic energies may provide us with a partonic system whose size is approximately in between those produced by $p+p$ and Pb+Pb collisions. The experimental results on anisotropic flow in Xe+Xe and Pb+Pb collisions should provide us with an opportunity to study the system size dependence of $v_2$. In the present work, we have used a multiphase transport model to calculate charged particles' $v_2$ for Xe+Xe collisions at $\sqrt{s_{NN}}=5.44\mathrm{TeV}$. We have also tried to demonstrate the number of constituent quark, $N_q$, and $m_T$ scaling of the elliptic flow. We find that $n_q$ scaling of $v_2$ is not observed for the identified hadrons. The $v_2$ results from Xe+Xe collisions have also been compared to Pb+Pb collisions at $\sqrt{s_{NN}}=5.02\mathrm{TeV}$. We find that flow of charged particles in (50–60)% central collisions for xenon nuclei is almost 30% less than particle flow developed in lead ion collisions, implying the important role the system size plays in the development of particle collective motion in relativistic heavy ion collisions.

Figure 1

$p_T$ spectra of $\pi ,K$, and $p$ for (0–5)% centrality in Xe+Xe collisions. Circles are for pions, squares stand for kaons, and triangles represent protons. The vertical lines in data points show the statistical uncertainties.

Figure 2

Charged particles $v_2$ vs transverse momentum, $p_T$ (a), and pseudorapidity, $\eta$ (b). Different symbols are for ${\sigma }_{gg}=3\mathrm{mb}$ and 10 mb.

Figure 3

Charged particles $v_2$ as a function of transverse momentum, $p_T$ for different centrality classes. Different sections of the figure represent different centrality bins starting from (0–5)% (a) to (60–70)% (f).

Figure 4

Charged particles $v_2$ vs centrality for $\left|\eta \right|<0.8$.

Figure 5

Charged particles $v_2$ vs transverse momentum, $p_T$ for (50–60)% centrality of Pb+Pb and Xe+Xe collisions. Circles are for Pb+Pb collisions at $\sqrt{s_{NN}}=5.02\mathrm{TeV}$ and squares are for Xe+Xe collisions at $\sqrt{s_{NN}}=5.44\mathrm{TeV}$. The vertical lines in data points show the statistical uncertainties.

Figure 6

$v_2$ vs transverse momentum, $p_T$ of $\pi ,K$ and $p$ for (50–60)% centrality in Xe+Xe collisions. Circles are for pions, squares stand for kaons, and triangles represent protons. The vertical lines in data points show the statistical uncertainties.

Figure 7

(a) $v_2/n_q$ as a function of $p_T/n_q$ for $\pi ,K$, and $p$. (b) $v_2/n_q$ as a function of $(m_T-m_0)/n_q$ for $\pi ,K$, and $p$. Both plots are for 50–60% centrality bin and different symbols represent different particles. The vertical lines in data points show the statistical uncertainties.

Figure 8

$v_2$ vs transverse momentum, $p_T$ of charged particles for ALICE data [29] (circles) and AMPT-SM model (squares).